• Direct hot water cylinders with extra space for more hot water storage.
  • Internal view of ultrasteel plus hot water cylinder shows thick insulation and expansion space.

This model of direct unvented hot water cylinder features a built-in thermal expansion space, eliminating the need for an external expansion vessel, resulting in a faster, simpler installation with a reduced risk of call back. As with s... Read More


Built in Thermal Expansion Space


Duplex Stainless Steel


Integrated Immersion Heater & Thermostat


25 Year Guarantee* 

A convenient practical solution for providing mains pressure hot water where mains gas or other fossil fuel sources are not an option.

Features and benefits

  • Wide range of capacities from 120 to 300 litres
  • Built-in thermal expansion space for a quicker hassle-free installation 
  • New swivel T&P valve for easier installation
  • Integrated dual thermostat and immersion heater for faster response time
  • Mains pressure hot water for powerful showers
  • High flow rate ideal for homes with multiple bathrooms and fast filling of baths
  • Suitable for all electric buildings off mains gas supply or photovoltaic panels
  • Economical to run with minimal maintenance and no hidden costs
  • Suitable for use with off-peak/low tariff electricity
  • 50mm CFC and HCFC-free foam lagging for low heat loss
  • Manufactured from ‘Duplex’ stainless steel for superior corrosion resistance
  • 25-year guarantee on basic vessel and 2-years on components, subject to T&C's
* T&C's apply 25-year guarantee on basic vessel and 2-years on components. See useful documents for more information
Product Code Capacity (Ltrs)  Height (mm)  Diameter (mm) Load Profile

 ErP Rating* 


       kWh /    Year

Sound power level (dB)
 AUXD120   120  997  550  M  D  33%  1490  15
 AUXD150  150  1183  550  M  D  36%  2781  15
 AUXD180  180  1367  550  L  D  35%  2832  15
 AUXD210  210  1557  550  L  D  34%  2876  15
 AUXD250  250  1802  550  L  D  36%  4548  15
 AUXD300  300  2072  550  XL  D  36%  4567  15

*ErP rating based on thermostat set at 60°C